Letter to Pontecorvo from Dr Paul Christopher Mangelsdorf concerning Pontecorvo's decision to turn down the job at Harvard

Copy of a letter from Pontecorvo to Dr Paul Christopher Mangelsdorf of the Botanical Museum at Harvard University, concerning a number of matters, including making arrangements for his next visit to Harvard in April 1958

Copies of thank you letters sent from Pontecorvo to colleagues and friends met during his recent trip to Harvard University